EP 2770219 A4 20150701 - HYDRAULIC CONTROL DEVICE AND WORK MACHINE EQUIPPED WITH SAME
Title (en)
HYDRAULIC CONTROL DEVICE AND WORK MACHINE EQUIPPED WITH SAME
Title (de)
HYDRAULISCHE STEUERUNGSVORRICHTUNG UND ARBEITSMASCHINE DAMIT
Title (fr)
DISPOSITIF DE COMMANDE HYDRAULIQUE ET ENGIN ÉQUIPÉ DE CELUI-CI
Publication
Application
Priority
- JP 2011227749 A 20111017
- JP 2012006597 W 20121015
Abstract (en)
[origin: EP2770219A1] Provided is a hydraulic control device for which it is possible to suppress the occurrence of cavitation in a regenerative motor that regenerates the energy of a hydraulic actuator and to reduce the loss of power, and an operating machine having the same. The hydraulic control device includes: a recovery oil passage (R7) for recovering, into a tank (T), hydraulic fluid derived from a hydraulic actuator (11, 12) and a hydraulic pump (16, 17); a regenerative motor (18) that rotates an output shaft (7a) of an engine (7) in response to a supply of the hydraulic fluid and is driven to rotate by rotation of the output shaft (7a) of the engine (7); a regenerative oil passage (R8) for guiding return oil from a boom cylinder (12) to the regenerative motor (18) without passing the return oil through the recovery oil passage (R7); a coupling oil passage (R9) that couples the recovery oil passage (R7) and the regenerative oil passage (R8) to each other; and a regeneration-side check valve (21) that is provided on the coupling oil passage (R9), and allows the hydraulic fluid to flow from the recovery oil passage (R7) toward the regenerative motor (18), and moreover restricts the hydraulic fluid from flowing from the regenerative motor (18) toward the recovery oil passage (R7).
IPC 8 full level
E02F 9/22 (2006.01); F15B 11/02 (2006.01); F15B 21/14 (2006.01)
CPC (source: EP US)
E02F 9/2091 (2013.01 - US); E02F 9/2217 (2013.01 - EP US); E02F 9/226 (2013.01 - EP US); E02F 9/2285 (2013.01 - EP US); E02F 9/2289 (2013.01 - EP US); E02F 9/2292 (2013.01 - EP US); E02F 9/2296 (2013.01 - EP US); F15B 13/06 (2013.01 - US); F15B 21/14 (2013.01 - EP US); F15B 2211/20546 (2013.01 - EP US); F15B 2211/253 (2013.01 - EP US); F15B 2211/7053 (2013.01 - EP US); F15B 2211/7058 (2013.01 - EP US); F15B 2211/88 (2013.01 - EP US)
Citation (search report)
- [A] US 2007186548 A1 20070816 - SMITH DAVID P [US], et al
- [A] US 6460332 B1 20021008 - MARUTA KAZUHIRO [JP], et al
- See references of WO 2013057919A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2770219 A1 20140827; EP 2770219 A4 20150701; EP 2770219 B1 20161012; CN 103890412 A 20140625; CN 103890412 B 20160330; JP 2013087831 A 20130513; JP 5785846 B2 20150930; US 2014245729 A1 20140904; US 9803339 B2 20171031; WO 2013057919 A1 20130425
DOCDB simple family (application)
EP 12842326 A 20121015; CN 201280050962 A 20121015; JP 2011227749 A 20111017; JP 2012006597 W 20121015; US 201214350611 A 20121015